Formaldehyde　is　a　common　indoor　environmental　pollutant,　which　poses　a　great　harm　to　human　body.　In　this　study,　the　adsorption　behavior　of　a　novel　polyaniline/TiO2　(PANI/TiO2)　for　formaldehyde　from　air　at　room　temperature,　comparing　to　that　of　activated　carbon　and　glass　beads,　was　investigated,　and　the　mechanism　was　interpreted　in　details.　Polyaniline/TiO2　exhibited　enhanced　adsorption　capacity　of　0.67　mg　g−1　for　formaldehyde　acquired　from　the　Langmuir　equation,　which　was　higher　than　that　of　commercially　used　activated　carbon　of　0.50　mg　g−1.　While　polyaniline/TiO2　could　also　be　stably　recycled　by　using　simple　acid-base　treatment.　Moreover,　the　initial　adsorption　rate　order　of　polyaniline/TiO2>activated　carbon　>　glass　beads　was　acquired　from　kinetic　study,　confirming　the　superiority　in　the　formaldehyde　removal　of　our　polyaniline/TiO2.　Confirmed　by　adsorption　isotherm　study　and　various　characterization　experiments　including　X-ray　photoelectron　spectroscopy(XPS),　Fourier　transform　infrared　spectroscopy(FT-IR),　Scanning　electron　microscope(SEM)　and　N2　adsorption-desorption　isotherm,　the　adsorption　of　formaldehyde　on　to　polyaniline/TiO2　may　be　through　a　chemical　adsorption,　in　which　the　amine　and　imine　groups　in　the　polyaniline　chain　play　important　roles　in　the　interaction　between　polyaniline/TiO2　composite　and　formaldehyde,　and　the　formaldehyde　may　form　as　doping　groups　doped　onto　the　polyaniline/TiO2.　This　contributes　to　the　advanced　adsorption　affinity　and　capacity　of　polyaniline　towards　the　formaldehyde　even　in　a　trace　initial　concentration,　outperforming　the　commercially　available　activated　carbon　and　glass　beads　very　much.　These　novel　properties　allow　polyaniline/TiO2　to　be　applied　as　an　advanced　formaldehyde　scavenger　in　next　generation　to　protect　human　being　from　the　danger　of　formaldehyde,　challenging　present　commercially　available　formaldehyde　adsorbents　greatly.　©　2020　Turkish　National　Committee　for　Air　Pollution　Research　and　Control